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为验证利用开放光路傅里叶变换红外光谱法(OP-FTIR)测量工业区环境大气中1,3-丁二烯浓度的可行性,首先在实验室对配置的已知浓度的标准气体进行了测量研究。利用自行搭建的基于Bruker公司IR-Cube光谱仪的开放光路FTIR测量系统对不同浓度的1,3-丁二烯进行了测量,然后结合QASOFT数据库1,3-丁二烯的吸光度信息,利用非线性最小二乘拟合算法(NLLS)对测量光谱进行了浓度反演,并对测量系统作了线性标定。实验结果表明,开放光路FTIR测量系统性能稳定;系统响应快;线性度好,线性相关系数为0.998;系统对于1,3-丁二烯的检测下限约为18.77 mg.m-2。实验研究表明,OP-FTIR系统能用于区域环境大气的1,3-丁二烯的监测和研究,开放光路FTIR方法能够作为1,3-丁二烯的一种分析检测技术。
To verify the feasibility of measuring the 1,3-butadiene concentration in the ambient air of an industrial zone using open-fiber Fourier transform infrared spectroscopy (OP-FTIR), a calibration gas of known concentration was initially placed in the laboratory Measurement research. The open-path FTIR measurement system based on the Bruker IR-Cube spectrometer was used to measure 1,3-butadiene at different concentrations. Then, based on the absorbance information of 1,3-butadiene in QASOFT database, The Least Squares Fitting Algorithm (NLLS) performs a concentration inversion of the measured spectra and a linear calibration of the measurement system. The experimental results show that the open-path FTIR measurement system has stable performance, fast system response, good linearity, and a linear correlation coefficient of 0.998. The lower detection limit for 1,3-butadiene is about 18.77 mg.m-2. Experimental results show that the OP-FTIR system can be used for the monitoring and research of 1,3-butadiene in the regional ambient atmosphere. The open-path FTIR method can be used as an analytical detection technique of 1,3-butadiene.